Its been a while since I've seen it.. but I seen at least a good chunk of AUtB.... from what I remember the main male lead had a ingrain 'owe people nothing... what-so-ever... EVER!!!' complex that was kind of to the point of a blood line curse... like at four or five had to 'raise' his dad as a baby to make up for all the things he 'owed' his parents from the day he was born. Like changing him. In that family you owe nothing to no one. If you accidentally managed to owe anyone the slighted thing you MUST pay them back, yesterday. All you'd have to do have him owe an alien for something enough to get them to be his roommate and then he is doomed.
Okay now I want to see that guy in a Grail War or as a contender in the Sekerei Project just to see his response... I'm thinking a reality marble that inflicts a Red Dwarf Style 'Total Justice Field'... I have absolutely no clue how he would react to getting that unlimited credit card... unless he ends up as a participant in a Grail War happening during the Sekerei Project. Meaning that he must somehow fight a Grail War during a Sekerei War... without letting anyone die and win. Imagine this guy knowing that he he must fight two wars at once, in one of which the civilians are actively considered expendable resources, with incurring the slightest debt. Depending on what Servant say or do defeating them means owing them a major debt that can only be dodged by somehow granting their wishes and making them bow out of the war... this means both master's and Servants... without anyone getting killed (unless its an EPIC Battle wish that ends in all people happy with the results and no civies killed.)
I think this one is actually a bad idea for a crossover, because the sheer amount of win required to make this actually work right will force a black hole sucking all the awesome out of fanfiction for months.
Okay now I want to see that guy in a Grail War or as a contender in the Sekerei Project just to see his response... I'm thinking a reality marble that inflicts a Red Dwarf Style 'Total Justice Field'... I have absolutely no clue how he would react to getting that unlimited credit card... unless he ends up as a participant in a Grail War happening during the Sekerei Project. Meaning that he must somehow fight a Grail War during a Sekerei War... without letting anyone die and win. Imagine this guy knowing that he he must fight two wars at once, in one of which the civilians are actively considered expendable resources, with incurring the slightest debt. Depending on what Servant say or do defeating them means owing them a major debt that can only be dodged by somehow granting their wishes and making them bow out of the war... this means both master's and Servants... without anyone getting killed (unless its an EPIC Battle wish that ends in all people happy with the results and no civies killed.)
I think this one is actually a bad idea for a crossover, because the sheer amount of win required to make this actually work right will force a black hole sucking all the awesome out of fanfiction for months.